Performance Enhancement of Extended AFDX via Bandwidth Reservation for TSN/BLS Shapers Ana¨ ıs Finzi, Ahlem Mifdaoui et al. July 3, 2018, RTN’18 1/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives 2/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Up to 500 km of cables 2/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Up to 500 km of cables Heterogeneous network 2/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Up to 500 km of cables Heterogeneous network AFDX 2/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Up to 500 km of cables ARINC 429 Heterogeneous network AFDX 2/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Up to 500 km of cables ARINC 429 Heterogeneous network AFDX CAN 2/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Up to 500 km of cables ARINC 429 Heterogeneous network AFDX CAN MIL-STD-1553 2/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Current Avionics Communication Architecture limitations Heterogeneity : high complexity, delays and costs One criticality level : backbone supports only essential traffic Unfair service policy : strong impact of high priorities 3/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Context and Objectives Current Avionics Communication Architecture limitations Heterogeneity : high complexity, delays and costs One criticality level : backbone supports only essential traffic Unfair service policy : strong impact of high priorities Main Objective Homogenize avionics communication architecture → Extend the backbone network to support Safety-Critical and Best-Effort Traffics 3/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Avionics Requirements and Challenges Requirements Predictability : guaranteeing schedulability constraints, i.e. bounded delays respecting deadlines Modularity : minimizing the (re)configuration effort 4/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Avionics Requirements and Challenges Requirements Predictability : guaranteeing schedulability constraints, i.e. bounded delays respecting deadlines Modularity : minimizing the (re)configuration effort Challenges ց Complexity : Reduce the implementation and configuration effort ր Fairness : Limit the impact of high priorities on lower ones 4/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Promising Solution TTE 1 TAS 2 PS 3 UBS 4 BLS 5 CBS 6 NP-SP 7 DRR 8 Solutions Modularity X X X �� �� �� �� �� Predictability �� �� �� �� �� � �� �� Fairness X X � �� �� �� X �� Complexity X X X X �� �� �� � Existing solutions vs avionics requirements and challenges �� : � : X: 1 Time Triggered Ethernet 2 Time Aware Shaper 3 Peristaltic Shaper 4 Urgency Based Scheduler 5 Burst Limiting Shaper 6 Credit-based Shaper 7 Non-preemptive Static Priority 8 Deficit Round Robin 5/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Promising Solution Schedulers TTE 1 TAS 2 PS 3 UBS 4 BLS 5 CBS 6 NP-SP 7 DRR 8 Solutions Modularity X X X �� �� �� �� �� Predictability �� �� �� �� �� � �� �� Fairness X X � �� �� �� X �� Complexity X X X X �� �� �� � Existing solutions vs avionics requirements and challenges �� : � : X: 1 Time Triggered Ethernet 2 Time Aware Shaper 3 Peristaltic Shaper 4 Urgency Based Scheduler 5 Burst Limiting Shaper 6 Credit-based Shaper 7 Non-preemptive Static Priority 8 Deficit Round Robin 5/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Promising Solution TTTEch Schedulers TTE 1 TAS 2 PS 3 UBS 4 BLS 5 CBS 6 NP-SP 7 DRR 8 Solutions Modularity X X X �� �� �� �� �� Predictability �� �� �� �� �� � �� �� Fairness X X � �� �� �� X �� Complexity X X X X �� �� �� � Existing solutions vs avionics requirements and challenges �� : � : X: 1 Time Triggered Ethernet 2 Time Aware Shaper 3 Peristaltic Shaper 4 Urgency Based Scheduler 5 Burst Limiting Shaper 6 Credit-based Shaper 7 Non-preemptive Static Priority 8 Deficit Round Robin 5/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Promising Solution IEEE Time Sensitive Networking TTTEch Schedulers TTE 1 TAS 2 PS 3 UBS 4 BLS 5 CBS 6 NP-SP 7 DRR 8 Solutions Modularity X X X �� �� �� �� �� Predictability �� �� �� �� �� � �� �� Fairness X X � �� �� �� X �� Complexity X X X X �� �� �� � Existing solutions vs avionics requirements and challenges �� : � : X: 1 Time Triggered Ethernet 2 Time Aware Shaper 3 Peristaltic Shaper 4 Urgency Based Scheduler 5 Burst Limiting Shaper 6 Credit-based Shaper 7 Non-preemptive Static Priority 8 Deficit Round Robin 5/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Promising Solution TTE 1 TAS 2 PS 3 UBS 4 BLS 5 CBS 6 NP-SP 7 DRR 8 Solutions Modularity X X X �� �� �� �� �� Predictability �� �� �� �� �� � �� �� Fairness X X � �� �� �� X �� Complexity X X X X �� �� �� � Existing solutions vs avionics requirements and challenges �� : � : X: 1 Time Triggered Ethernet 2 Time Aware Shaper 3 Peristaltic Shaper 4 Urgency Based Scheduler 5 Burst Limiting Shaper 6 Credit-based Shaper 7 Non-preemptive Static Priority 8 Deficit Round Robin 5/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Promising Solution TTE 1 TAS 2 PS 3 UBS 4 BLS 5 CBS 6 NP-SP 7 DRR 8 Solutions Modularity X X X �� �� �� �� �� Predictability �� �� �� �� �� � �� �� Fairness X X � �� �� �� X �� Complexity X X X X �� �� �� � Existing solutions vs avionics requirements and challenges �� : � : X: 1 Time Triggered Ethernet 2 Time Aware Shaper 3 Peristaltic Shaper 4 Urgency Based Scheduler 5 Burst Limiting Shaper 6 Credit-based Shaper 7 Non-preemptive Static Priority 8 Deficit Round Robin 5/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Promising Solution TTE 1 TAS 2 PS 3 UBS 4 BLS 5 CBS 6 NP-SP 7 DRR 8 Solutions Modularity X X X �� �� �� �� �� Predictability �� �� �� �� �� � �� �� Fairness X X � �� �� �� X �� Complexity X X X X �� �� �� � Existing solutions vs avionics requirements and challenges �� : � : X: → the Burst Limiting Shaper is the most promising solution 1 Time Triggered Ethernet 2 Time Aware Shaper 3 Peristaltic Shaper 4 Urgency Based Scheduler 5 Burst Limiting Shaper 6 Credit-based Shaper 7 Non-preemptive Static Priority 8 Deficit Round Robin 5/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Followed Methodology Specification of an Extended AFDX → Low complexity and few hardware/software modifications a a [ERTS2-18] Finzi, A., Mifdaoui et al., ”Mixed-Criticality on the AFDX Network: Challenges and Potential Solutions”, ERTS 2018 6/27
Context and Objectives System Model Bandwidth Reservation Methods Performance Evaluation Conclusion Followed Methodology Specification of an Extended AFDX → Low complexity and few hardware/software modifications a a [ERTS2-18] Finzi, A., Mifdaoui et al., ”Mixed-Criticality on the AFDX Network: Challenges and Potential Solutions”, ERTS 2018 Formal timing analysis → New Network Calculus model with good tightness a a [WFCS-18] Finzi, A., Mifdaoui et al., ”Incorporating TSN/BLS in AFDX for Mixed- Criticality Applications: Model and Timing Analysis”, WFCS 2018 6/27
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